Forerunner 255 Vector 3 power meter Edge 1030 plus Hrm pro plus

Setup

multiple sports mode with (Watch HRM Vector 3 ) and (edge HRM vector3)

Watch setup for multi sports mode recoding and bike computer setup for reading while cycling . Then discard the ride from the bike computer as I could not merge the cycling activity to other activities.

Watch power meter in Bike mode ,did calibration before the start and it shows 5-10Watts lower than my actual power but i can stand it. When i do a multiple sports mode, Triathlon or Bike and Run , my cycling power reading in forerunn255 shows lower different results from edge 1030 . For separate activities , always start the auto calibration in edge1030 for vector 3 power meter and i know my power and its accurate. When i do brick sessions or triathlons , i just skipped the power meter calibration but edge1030 reads the same number i used to have it. At the same time in watch, power reading is 30-40W lesser than my normal watts.

Checked and changed the battery in power meters, reset, repaired and done all the things possible to the watch, bike computer and power meter, but still the same not accurate readings in the watch. Without calibration in multiple sports mode with the watch is the problem ?(tho reading with bike computer is correct(accurate) at the same time).

Anyone have the same problem or shar me a solutions, please. Kudos!