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Boot failure after installing LSI 9201-16e

I have installed an IT mode LSI 9201-16e in my Dell R720 server to attach external disk shelves to it.

The server already has an IT mode LSI 9211-8i card installed in it with 2 boot SSDs attached to it, that were previously working fine and had no issues booting pre- LSI 9201-16e being installed.

After installing the 9201-16e, during the boot process I get the following messages:

boot failed: linux boot manager
boot failed: linux boot manager
boot failed: windows boot manager

I have already successfully erased the BIOS image from the 9201-16e card to prevent the system from trying to boot from it.

I have also went in to the Avago Configuration Utility (via ctrl-c hotkey) for the LSI 9211-8i, changed the boot order to the correct one, and disabled boot all together on the 9201-16e. I still cannot get my SSDs to boot.

When I remove the 9201-16e card, the boot sequence works fine and OS successfully boots. What could be the issue here?