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Thanks, they're one piece, definitely slightly proud of the frame. I feel like it may be missing a part as the latch actually does nothing and I have to crack the handle up (which presumably extends the deadbolt?) To get it to stay closed). Might be another case GSI (get someone in) as I think the door has sagged slightly and my back door needs some attention too... ahem. At current DIY rates I'll not get to it until spring and then likely forget about it again.
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It looks like the squashed/cut away part is where a separate deadbolt keep may be on the frame. It looks similar to an old GU locking mechanism and two part centre keeps are common with them.
If the keeps on the door frame are two separate pieces for the (upper)latch and (lower) deadbolt , the seal may be compressed there, if the deadbolt keep is proud of the frame. In which case it will happen again in the future, meanwhile the extra compression will put more pressure on the locking mechanism.
Trap a thin sheet of paper or plastic in the door when you close and lock it. If the paper needs a slight tug to remove it, I would be inclined to leave it. If the paper slides ip and down easily and offers no resistance to being pulled out, definitely look at adjustment of the door and mechanism, then maybe replace the seal.