If we type the desired phrase into the search-filter element at normal speed, it seems that part of the phrase is automatically deleted. This is actually related to the Ajax operation.
But if you try the wp grid builder search filter here, there will be no problem even if you type at a slow speed.
Please watch the video below. Some words are automatically deleted as you type.
Noticed the same problem. After about 1 second, if you type slowly, the search starts and anything entered after the search starts is deleted.
Perhaps it could help if we could configure the delay or lock the input after the search has started. Or even better would be to cancel the current search when a new input is recognised.