Sitecore WFFM : Creates a duplicate field section upon submission - sitecore

Question

I tried almost every search combination I know for this issue over the internet; been reading articles that might help resolve the issue, but I wasn't able to find any help.
Debugging (no exception during debug process), and reading logs doesn't give much information (no exceptions in the log file).
If you know a post that is related to this, please comment below. Otherwise, let me give it a try here.
Edited: Tried also in Sitecore Instance v.8.1 Update-2, same problem was encountered.
Let me describe the issue:
Using SC Instance v.8.0 Update-3 (freshly installed with no customizations)
Using WFFM v.8.0 Update-2 (compatible with SC instance 8.0-U3)
I have 11 field sections in a CONTACT US form page, here are:
The Section A is the 1st field section and the Section K is the 11th field section of my Contact Us page.
Section A
A1 Single-line text field | NOT required
A2 Single-line text field | NOT required
A3 Single-line text field | NOT required
A4 Single-line text field | NOT required
A5 Single-line text field | NOT required
A6 Single-line text field | NOT required
A7 Single-line text field | NOT required
A8 Single-line text field | NOT required
A9 Single-line text field | NOT required
A10 Single-line text field | NOT required
Section B
B1 Single-line text field | NOT required
B2 Single-line text field | required WITH NUMBERS ONLY VALIDATION
B3 Single-line text field | required WITH NUMBERS ONLY VALIDATION
B4 Single-line text field | NOT required
B5 Single-line text field | NOT required
B6 Single-line text field | NOT required
B7 Single-line text field | NOT required
B8 Single-line text field | NOT required
B9 Single-line text field | NOT required
B10 Single-line text field | NOT required
Section C
C1 Single-line text field | NOT required
C2 Single-line text field | NOT required
C3 Single-line text field | NOT required
C4 Single-line text field | NOT required
C5 Single-line text field | NOT required
C6 Single-line text field | NOT required
C7 Single-line text field | NOT required
C8 Single-line text field | NOT required
C9 Single-line text field | NOT required
C10 Single-line text field | NOT required
Section D
D1 Single-line text field | NOT required
Section E
E1 Single-line text field | NOT required
E2 Single-line text field | NOT required
Section F
F1 Single-line text field | NOT required
F2 Single-line text field | NOT required
Section G
G1 Single-line text field | NOT required
G2 Single-line text field | NOT required
G3 Single-line text field | NOT required
Section H
H1 Single-line text field | NOT required
H2 Single-line text field | NOT required
H3 Single-line text field | NOT required
H4 Single-line text field | NOT required
Section I
I1 Single-line text field | NOT required
I2 Single-line text field | NOT required
I3 Single-line text field | NOT required
I4 Single-line text field | NOT required
Section J
J1 Single-line text field | NOT required
J2 Single-line text field | NOT required
J3 Single-line text field | NOT required
J4 Single-line text field | NOT required
Section K
K1 Single-line text field | NOT required
K2 Single-line text field | NOT required
K3 Single-line text field | NOT required
K4 Single-line text field | NOT required
As shown above, there are only two (2) required fields, they are:
B2 - accepts numbers only
B3 - accepts numbers only
And the rest are optional, and can leave blank.
My ultimate goal: Just fill up the required fields, and submit the form! (Looks pretty straight forward, isn't it?)
But the problem here is, when you submitted the form page. The page will reload and creates a duplicate Section B at the bottom of the page and the Section K will be removed also. Something like this:
Surprisingly, when I deleted one (1) section to make it a total of 10 sections OR less than 10 sections then submit the form, the form will be submitted successfully and I would able to see an entry in the reporting database and in form report page.
Anyone encountered this kind of issue before? Is this a known issue? Or a bug?
Things that I least wanted to try, but just to give a shot:
Clear browser cache, check in most browsers (Firefox, IE and Chrome) - Didn't work
IISReset - Didn't work either.
Supporting files:
Video: http://screencast.com/t/wtgh2b8M1U
I packaged the form for whoever wanted to try it on their local machine
OneDrive > Download here. - Do not forget to add section K once installed.
Appreciate your time and effort. Thanks

Answer 1

To answer my question:
Yes, it is a bug in Sitecore. See the link below on how to implement the Sitecore patch provided by the SC support.
https://sitecorelogy.com/2016/07/19/fixed-sitecore-wffm-creates-a-duplicate-field-section-upon-submission-when-exceeded-to-10-sections/