Random phone number instead of mine appears on callee's phone

Ok, so this happens pretty randomly, and only when the person I'm calling is outside UK (roaming).

Scenario: I call the other person with my UK SIM, me being in UK. The other person, outside UK, receives my call, but instead of seeing my phone number, a different number is displayed on her phone. This different number seems to have the format of the country she's in.

This is happening rarely and at random, moreover, the number shown is different every time.

Has anyone experienced this...

Random phone number instead of mine appears on callee's phone

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