[Freesurfer] Volumes differ in acquisition paramaters

Dear Freesurfer group,

When looking through the log after running recon-all, i have noticed two different errors in the logs. The one being about 'volumes differ in acquisition parameters' and the other 'Image geometries differ across time, maybe due to aquisition changes?'.

*Volumes differ in acquisition parametersv1acq fa=0.000000 tr=10.032000 te=0.000000 ti=0.000000v2acq fa=0.000000 tr=10.012000 te=0.000000 ti=0.000000WARNING: Image geometries differ across time, maybe due to aquisition changes?This can potentially bias a longitudinal study! Will continue in 10s.*

What do the above errors mean and is it something we should be worried about?

Best regards, Kasper Jessen MD, PhD Student