Issue with two external monitor with different aspect ratio.

I have two monitors:

An LG 34WK95U-W 21:9 5160*2160

and an Acer Predator XB271HK 16:9 3840*2160

I have an MBP 2017 15" with AMD 560 on Catalina with the latest update 10.15.2 (19C57).

The LG is connected using Thunderbolt 3, and the Acer with DisplayPort -> Thunderbolt Hub -> Macbook

When the two are connected my LG can only go up to 3840*2160 which is not even the correct aspect ratio, but when the Acer is not connected I don't have any issue.

Any idea on how to solve this issue?