Data mixed up from different networks?

I have been using the tower collector app for a few weeks now and have been busy uploading data to opencellid. For a while I used two SIM cards (234-20 and 234-30) at the same time in my phone.

I have been checking the map and found three LTE pins in a cluster, for one of the pins, the LAC does not belong to the MNC-MCC shown.

here is the data:

MCC: 234
MNC: 30
LAC: 1202
CID: 4057351
Radio Type: LTE

Latitude: 51.623959
Longitude: 0.49999
Range: 1000 m

1 measurements
Created: 2021-11-12T16:31:53.000Z
Updated: 2021-11-12T16:31:53.000Z

I have compared that with the CSV files which I saved and LAC 1202 is used by network 234-20, not 234-30. The other two pins are correct. The CID is a valid CID for 234-30.

There is another pin a little further north, where the combination of MNC/MCC and LAC is correct

MCC: 234
MNC: 20
LAC: 1202
CID: 507392
Radio Type: LTE

Latitude: 51.626208
Longitude: 0.500635
Range: 2074 m

45 measurements
Created: 2021-08-29T10:48:38.000Z
Updated: 2021-11-20T04:35:32.000Z