I've never had this issue, at all.
I've talked to multiple other people who have, so it's not just me. Plus it happens to me on multiple devices.
All the extra stuff on the page also makes it take longer to load. if you use software that just gives you a link directly to the image, no one has to deal with that.
You really can't say Lightshot is fastest, because they all do the same exact thing (push hotkey, select image area, program uploads for you and gives you link)
So, op, what do you prefer?
If you like ads and stuff all over your images, go with Lightshot
Or, if you prefer a service that was once hacked and infected everyone using it with malware, you can use Puush instead.
Or you can choose "none of the above" and get ShareX