Possible... but I would not be so sure: my HPT is SSD7101A-1 that is declared NON-bootable (even if someone says it works as bootable in some system), while another model is SSD7103 that IS bootable. So, if a model is NON-bootable means it does expect another different drive will be the bootable one!
You could say: ok, but for HPT SW sake, the bootable drive must not be an SSD model!
...This would mean that HighPoint has in mind a system with an HDD as bootable drive? This is not realistic, since in their home page there is a new 2019 Mac Pro as example...
BUT!!! Every system is a system
per se! For example: my system is an hackintosh (a PC machine that runs OSX Mojave) and you can notice I have (had) a problem very similar to your, while in
genuine-old-MacPros community I never heard problems like that. My personal opinion is that HPT is optimized for Mac HW, and works “also” in “some” PC HW with some unpredictable problems that “could” happen (and that you have to face somehow on your own...)
Since my long chats with HighPoint, I realized that once a problem appears, you can't permanently solve it, but you can minimize it with some “strategy” that you elaborate after a lot of tests.
The only thing we can do for the community is sharing our experiences to hopefully help others on solving their problems.