Is this a common fault…

[Hayleylb86]

The rubber seal on the passenger rear door is coming away and hanging out the door. My ex also has a focus and had the same issue and I’ve seen lots of other focus’ with the same issue! I can’t even get it back in! 
I’ve tried to upload a picture but it is too big. 

[RAIDER32]

1 hour ago, Hayleylb86 said:

The rubber seal on the passenger rear door is coming away and hanging out the door. My ex also has a focus and had the same issue and I’ve seen lots of other focus’ with the same issue! I can’t even get it back in! 
I’ve tried to upload a picture but it is too big. 

Like this?

Yeh it's very common, a bit strange that it's mainly on the rear doors.

I bought some double sided VHB tape in 10mm and it's been fine for 6 months.
https://www.ebay.co.uk/itm/324258549854
I first tried some carpet tape but that didn't last long, so get some good stuff and clean it good first.

[alanfp]

... or a silicone adhesive.  

Maybe silicone sealant? but I haven't tried that.

[DaveT70]

Super glue, clean the surfaces first

[Dave.tam]

Very common! Does it on my wife’s Puma too