Sometimes the antivirus engines can detect good programs as malware, for example when I code a simple app (on Kodular or on another platform), it can detect as malware. You may need to buy a certificate to prove your app is safe.
Also, PUP is not a virus. It means Potentially Unwanted Program, and these apps usually contain junk content, a lot of ads or something looks which is unsafe.
And looks like these app stores checking the APK with their own engines, so it is normal that these app stores thinking your app is malware like as in VirusTotal. When your app passes the malware check without any problem, then Mi Store and Huawei Store won’t think your app as malware.