Column headers of Shiny data table gets shifted - shiny

Question

When I run my Shiny app, the headers of my data tables get shifted to the left. See below.Say this table is on Tab A.
The headers get aligned correctly when I click on a different tab (Tab B),then click on Tab A again. See below for the corrected headers.
Any idea what's causing it? Below is a simplified version of my code. Thanks in advance!
ui.R
library("shinythemes")
fluidPage(title = "Segmentation App", theme = shinytheme("spacelab"),
navbarPage("Segmentation", id = "allResults",
tabPanel(value='result_scorecard', title='ScoreCard',
sidebarLayout(
sidebarPanel(
h4("Select a cluster solution to profile"),
width = 3
),
mainPanel(
verticalLayout(
helpText(strong('Summary of Cluster Solutions')),
column(DT::dataTableOutput('out_best'), width = 12),
helpText(strong('ScoreCard Table')),
column(DT::dataTableOutput('out_scorecard'), width = 12)
)
)
)
),
tabPanel(value='profile', title='Profile',
verticalLayout(
column(DT::dataTableOutput('prop_by_cluster_ind'), width=10)
)
)
)
)
server.R
function(input, output, session) {
best_sols <- reactive({
A <- c(100, 101, 201)
B <- c(100, 101, 201)
C <- c(100, 101, 201)
temp <- as.matrix(cbind(A, B, C))
colnames(temp) <- c("A", "B", "C")
rownames(temp) <- c("k=1","k=2","k=3")
return(temp)
})
score_seg <- reactive({
A <- c("solution=1","solution=2","solution=3","solution=4","solution=5")
B <- c(100, 101, 201, 333, 444)
C <- c(100, 101, 201, 333, 444)
temp <- data.frame(A, B, C)
colnames(temp) <- c("A", "B", "score_seg")
return(temp)
})
profile_result_ind <- reactive({
A1 <- c("var1","var2","var3","var4","var5")
A2 <- c("var1","var2","var3","var4","var5")
B <- c(100, 101, 201, 333, 444)
C <- c(100, 101, 201, 333, 444)
temp <- data.frame(A1, A2, B, C)
colnames(temp) <- c("","","1","2")
return(temp)
})
# Table 1
output$out_best <- DT::renderDataTable({
DT::datatable(best_sols(), caption = "", rownames = TRUE, options = list(autoWidth = TRUE, scrollX = TRUE, columnDefs = list(list(width = '100px', targets = 1)), paging = FALSE, searching = FALSE), selection='none') %>% formatRound(1:5, 3)
#}
})
# Table 2
output$out_scorecard <- DT::renderDataTable({
DT::datatable(score_seg(), caption = "", rownames = F, options = list(autoWidth = TRUE, scrollX = TRUE, columnDefs = list(list(width = '200px', targets = 1)), paging = FALSE, searching = FALSE), selection='single') %>% formatRound(1:5, 3)
})
# Table 3
output$prop_by_cluster_ind <- DT::renderDataTable({
DT::datatable(profile_result_ind(), class= 'compact stripe', caption = '', rownames = F, options = list(autoWidth = TRUE, scrollX = TRUE, columnDefs = list(list(width = '300px', targets = 1), list(className = 'dt-left', targets="_all")), paging = FALSE, searching = FALSE)) %>% formatStyle(as.character(seq(1:2)))
})
}

Answer 1

I figured it out.
The headers will be aligned correctly if we change the autoWidth option to FALSE.

Answer 2

I had a table with long rownames such as you and had a similar problem with offset column names, but setting autoWidth=FALSE did not solve the problem. I discovered that it was being caused by scrollX=TRUE. I changed ScrollX=FALSE and wrapped the datatable in a div with overflow-x=TRUE to regain the scroll feature:
div(style="overflow-x:auto",renderDataTable({tableName},options=list(scrollX=FALSE))