I'm on Chrome. Do you have a report link in the lower left corner of posts? If so, is there the word Edit next to it?
Can you take a screen shot of your post you can't edit, and post it? OH WAIT this is awesome, you can actually just paste in a screen shot to a post, you don't have to host externally anymore!!
Paste in a screen shot so I can look. Make it as big as possible so I can see detail. If possible just send me a clip of the post itself.
We tested this quite thoroughly and Xenforo is widely used and very modern so I'd be surprised if you actually can't edit but if you can't then yeah we need to figure that out ASAP because it means others can't too.
We are certainly not prioritizing mobile, I've tested on both and I still like it better on desktop. Just because mobile Internet suxxxxxxxxx.