delta combee sprite returning after catching it

[Former user]

I caught delta combee and wanted to try catching another one, so i went back into the hidden grotto, and there was another delta combee. But when i tried to interact with it, nothing happened. I tried to leave the grotto and re-enter to see what happens, and even refreshed the map but nothing changed.

[Timothy McDowell]

All pokemon from grottoes leave an image of themselves behind until they are replaced the next day.