Did you buy OpenGarage from us or did you build one yourself? I am not aware of this as a common problem. If you build it yourself, you need to be careful which GPIO pin you use for the relay — the official OpenGarage uses GPIO 15, which is pulled down at boot so shouldn’t trigger any action. If you used other pins, some of them will briefly go high which will trigger garage door action.
I have bought opengarage from you, and I have 2 device, with same configuration, and only one of this have this problem, but this was not present when I have bought my device, I have noted this after some firmware upgrade