OpenPLi relies on drivers provided by manufacturer in this case VU+ what don't you understand in this?
You report no problem on your DM nor on your Xtrend so conclusion is problem is specific to.... VU+!
So the bug is in the VU+ drivers not in the OpenPLi development, drivers are closed source so only VU+ can fix them.
Try with other images they are plenty available for VU+ and check yourself, you should probably have the same behavior.
So either convince VU+ to provide proper drivers or purchase another brand that provide image team with correct driver support...
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Sat: Hotbird 13.0E, Astra 19.2E, Eutelsat5A 5.0W
VU+ Solo 4K: 2*DVB-S2 + 2*DVB-C/T/T2 (used in DVB-C) & Duo 4K: 2*DVB-S2X + DVB-C (FBC)
AB-Com: PULSe 4K 1*DVB-S2X (+ DVB-C/T/T2)
Edision OS Mio 4K: 1*DVB-S2X + 1*DVB-C/T/T2