Edit text changes line spacing in newly installed V7

Adding a character in a block of text slightly increases spacing for next line so making the text block disjointed.
Even deleting a single character and then typing same character back in increases line spacing. However inserting same character by undoing deletion does not affect line spacing.

This is a common edit I do in PDFA V4 to update page number references without problem.
Excess line space is not acceptable in V7.

Problem did not occur in version 4 (or at least I thought it was V4, but about box says V1.2.97.14551)
I'm unable to us V7 until this is fixed.
Anybody any ideas?

Kindly contact the PDF Architect Support team for further assistance: https://support.pdfarchitect.org/hc/en-us/requests/new