Hi,
For the original question. Looks like might be hardware related. I would try hints from this message,
I have decribed a bit different problem that I have in my boiler room here
the topic seemed correlate better than the topic of this thread. But maybe it is related
all of my sensors (15) are detected, but their addresses are mapped to different names. looks like not related to hardware, but I might be wrong
also it looks like I am using my sensors for same type of system as mentioned here 
Please take a look. 
Update:
After more time spent investigating I concluded that the addresses assigned to DS18B20’s are not tied to the sensor chips 
Can someone take a look at the description of my struggle and confirm I have a correct conclusion?
Update 2
Looks like I found a bug in Tasmota after all.