Calibration problem power plug

I am trying to calibrate my Tasmota EU power plug.

I corrected 220 volt to 231 volt as measured, that went well.

But for power and also current, it seems like there is some kind of maximum value/limit involved.

For power I tried this,

Measurement = 943 Watt, but max. correction is up to 870 Watt, not higher.

Measurement = 1850 Watt, but max. correction is up to 1730 Watt, not higher.

Is there a ceiling for correction or did I overlook something?

I use cmnd: PowerSet <####.#> , also tried PowerCal ( via MQTT)

Can you help me with this issue?

Here is the info about the powerplug,

Athom Power Monitoring Plug PP01

Program Version10.1.0(tasmota)

Build Date & Time2021-12-08T14:47:33

Core/SDK Version2_7_4_9/2.2.2-dev(38a443e)

Uptime3T01:04:48

Flash write Count243 at 0xF5000

Boot Count14

Restart ReasonSoftware/System restart

Friendly Name 1HenkieSwitch

AP1 SSId (RSSI)SKJL (100%, -50 dBm) 11n

HostnamePP01-3153

MAC Address4C:EB:D6:02:4C:51

IP Address (wifi)192.168.0.173

Gateway192.168.0.1

Subnet Mask255.255.255.0

DNS Server1195.130.131.3

DNS Server2195.130.130.3

HTTP APIEnabled

MQTT Host192.168.0.21

MQTT Port1883

MQTT UserDVES_USER

MQTT ClientDVES_024C51

MQTT TopicPP01

MQTT Group Topic 1cmnd/tasmotas/

MQTT Full Topiccmnd/PP01/

MQTT Fallback Topiccmnd/DVES_024C51_fb/

MQTT No RetainDisabled

EmulationNone ESP

Chip Id150609 (ESP8266EX)

Flash Chip Id0x1540A1

Flash Size2048 kB

Program Flash Size1024 kB

Program Size616 kB

Free Program Space384 kB

Free Memory26.7 kB