Mine is the same too, as is every other ti i've ever seen, been in - or looked at photos of!
It bothers me, so I ordered a couple of metres of carpet to sort it out.
It arrived a couple of days ago, and although it's by no means a perfect colour match - I've pushed the carpet into positon and hidden the other edge under some custom mats I have.
It looks much better - I'll take a photo when I have a second.
I wanted to post because I've been left with a large amount of carpet which I simply have no use for. If anyone wants a similar peice cutting, you're completely welcome to it free of charge - I reckon I could easily cut another 4 or 5 peices of out what I have left.
Let me know if you're interested.