Copy/paste of incongruent columns pastes everything to one column

[wd_perf]

There is already this issue, but I"m not sure if I should continue posting there or not:
https://paramquery.com/forum/index.php?topic=2569.msg9912#msg9912

Steps to replicate:
1) Go to https://paramquery.com/pro/demos
2) Click "Cut copy paste" demo
3) Hold down Command/Alt key and select column A and C or any columns not next to one another in Grid A
4) Click "Copy" in Grid A
5) In Grid B click "Paste"

Note, data for both columns is pasted into one column, with data for column C below the data for column A.

When copying data from adjacent columns the data looks like this:
a1     b1
a2     b2
a3     b3

But when copying from non-adjacent columns the copied data looks like this:
a1
a2
a3
b1
b2
b3

So I believe the issue is in copying, not pasting.