Hi Adi,
When you say an “artifact was introduced”, are you referring to the red overlay having much less brain data? If so, you can run tedana with a mask option, see here Visualisation of component beta maps using Tedana - #4 by dowdlelt That may solve that problem.
It may also be useful to provide other details about this data - such as field strength, number of echoes, number of time points, TR, TEs, acceleration, voxel size, etc - but if it is just the masking issue, then that may not be needed.