It doesn't just affect object hotspots, it is any element you want to stretch.
I always have those delta buttons activated, but in the last few versions I have noticed that the x-y delta is of by default or it is somehow turning itself off.
Here are just a couple of posts on the same subject.
My only tip is to make sure those delta buttons are always active.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10