[1000mp] What is Wrong with SWR Meter?

[Pawel, SP7PS]

Hello MP Users,

Would you please to help me with the following problem: my FT-1000MP's SWR
meter shows 1:2, but external SWR & Power Meter shows perfect match of the
antenna 1:1 - no reflected power... It is on all bands, sometimes MP shows
SWR 1:3 while external meter tells it is 1:1.5 (on other antenna).
What is wrong with the transceiver? It also shows about 70 Watts output
though external power meter shows 100 Watts....

Should I try to adjust any settings to make SWR meter work right?

Awaiting your suggestions.
Best 73's
Pawel, SP7PS
SN7N in contests