The progression bar in the modular workbench isn't accurate to the percentage of the progression.

I'll look into it and try to fix for the next update, thanks for the report! Also, weird note, those texts are meant to be very colorful... Don't know why it's all white there.

Could there be another mod interfering?

I just probably made a mistake somewhere

Let me know if I can help testing. I'm currently hosting an experimental 1.16.2 dedicated server for this purpose.

Oh, good to know, this will be helpful to test the next update since it adds a bunch of things (and probably 2x bugs) if the server is still up by then!

It will be! I'm also open for more players. We're currently with 5 people, so it's hard to get everything tested. Though I'm sure the flood of new releases will slow done in a while. Right now AE2 and its mod interactions are the big thing to test.

This should be fixed as of 1.6.0-BETA which you can download https://www.curseforge.com/minecraft/mc-mods/industrial-revolution/files/3043918. Thanks for the report!