Same as previous issues with xp duplication-
In this case xp tap, singularity tank and EnderIO experience rod.

FTB Beyond modpack
M_G_U version 0.1.8.21

idk.
This has been fixed and the code hasn't been touched since. I'm no longer going to attempt to correct the mod interaction with EndeIO's xp duplication wand. I'm sorry, but I have no idea why this is happening again. If it is a game breaking problem, I would suggest just not using Mob Grinding Utils and just use EnderIO blocks, as it is a much better mod and does everything you need.

Sorry, didn't mean to sound pretentious. My granddaughter found it actually and is respecting my wishes not to exploit it. All is good with your mod from our perspective. Just thought a heads up was in order (maybe more so for future expert versions).

Regards

Hello,
No need to apologise - I'm the one who should be sorry - I didn't mean to sound so unhelpful, I'll take another look at the code when I can get a chance and see if I can figure out what the issue is this time.
Thanks for the report.
Cheers,
Me.