Non-linear output signal through ANTSDRE200

[spwaghmare24]

I'm observing non-linearity in the output signal when testing with the ANTSDR-E200. Here's what I found:

Using BIST Tone Injection Point at TX: (In IIO Scope)
The output signal is linear and shows stable power.

Using BIST Tone Injection Point at RX: (In IIO Scope)
The output signal becomes non-linear and the output power is unstable.

In Loopback Mode (RF RX → RF TX): (In IIO Scope)
The output power is very poor and highly non-linear. Please find attached screenshot

please suggest the solution for linear output signal/stable output power.

Using BIST Tone Injection Point at RX:

Using BIST Tone Injection Point at TX

Loopback Mode (RF RX → RF TX)