Good afternoon!

You're right, we made s small correction for this in the Hornby library, and not in the Peco library.

The difference is 0.38mm (0.015").

We'll fix it in the next release.

In the meantime, you can solve this with the following steps:
1. Disconnect the offending turnout (without moving it!)
2. Right-click the left hand side endpoint of the turnout, and correct the value for the X coordinate.
3. Right-click each turnout, and glue them.
4. Try to drag either one of the turnouts, so the track reconnects. Because the track is glued, it won't move, it will just connect.
5. Unglue.

If you need more of these crossovers, copy/paste and/or flip them, so you don't have to correct each and every one as described above.

David.