English 1 Pound Error?

I found some English 1 pound coins where when you line the letters on the reading up the coins obverse/reverse don't line up.

The 't' is where the cross lines up on the coins in the pile.
1 and 2 have the same reverse and 3,4,5 have the same reverse.
when the reading lines up 1 shows obverse and 2 shows reverse.
3 shows obverse and 4,5 show reverse.

The lettering is also different.







Is it usual for this to happen on 1 pound coins?