click on the black upside down triangle to the left of the column groups and go to Advance Mode
you have to change some of the values for static rows:
1) FixedData True
2) KeepTogether True
3) KeepWithGroup After
4) RepeatOnNewPage True
ok now you may need to read a little more details
link 1
link 2
last link
all the above links solve this issue the same way
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