I don't believe this one is a but but more a css conflict with another plugin/theme.
Can you confirm this by temporarily disabling all your non-toolset plugins and possibly switching to a wordpress default theme and let me know if the problem still persists?
If it does can you provide me with a link to the search page so that I can provide you with some css to resolve this issue ?
A bug will need to be replicable on fresh install. In this case it wasn't.
I found the issue is that the gap css is being removed when the search is being performed. You can overwrite this by manually setting the gap for it with the css below.
.wp-block-columns{
gap:2em;
}
Please add this css to your views css section and let me know if it helps.
Thanks,
Shane