Impossible to write down some letters

the letters a, p, m, c and n are impossible to write down inside the bpmn

BPMN version : 1.7.2
Chrome version : 78.0.3904.108
(doesn’t work on IE and Edge as well)
Confluence version : 6.1.3

thank you

bpmn-js version 1.7.2 is very old. Did you check out the latest release?

I cannot find a more recent version, from what I read on the marketplace :
Version 1.7.2-MARKET • Confluence Server 5.7.1 - 7.1.1 • Released 2019-11-22

So what are you actually refer to? does not refer to Confluence.

Where did you find that information?

Do you mean that confluence extension: ?

That’s not a product supported or built by us.