I’ve noticed this problem on infosec.pub as well. If I edit a post and submit, the form is accepted but then the edits are simply scrapped. When I re-review my msg, the edits did not stick. This is a very old Lemmy bug I think going back over a year, but it’s bizarre how it’s non-reproducable. Some instances never have this problem but sdf and infosec trigger this bug unpredictably.
0.19.3 is currently the best Lemmy version but it still has this bug (just as 0.19.5 does). A good remedy would be to install an alternative front end, like alexandrite.