I think that there is something wrong with those Tecno devices. It's not the first topic on this forum about accuracy and Tecno devices please take a look here for example: How do i fix my gps accuracy?
@Mustardseed
you had the same device. Were you able to fix your problem?
You can also take a look at this article https://www.getdroidtips.com/how-to-fix-tecno-gps-problem-methods-quick-troubleshoot/