Breaking long line results are different is indent was run twice with the same option

[Zhaohan Zhou]

I am using GNU indent 2.2.10 on Ubuntu 10.04.4 LTS.
Indent works great except that long line will be handled differently
if I run indent twice with the same options against the same files.
E.g.
After first indent run, I got:

SYMX_SF_D16IE_CTL_SIZE (pIeNode->IeCtl.tVendorIE.
                                                     ulVendorLen));
run again, I got

                             SYMX_SF_D16IE_CTL_SIZE (pIeNode->IeCtl.
                                                     tVendorIE.ulVendorLen));
Actually, after running thrice, it will change back to
SYMX_SF_D16IE_CTL_SIZE (pIeNode->IeCtl.tVendorIE.
                                                     ulVendorLen));

Is this the expected behavior or what option should be used/unused to
avoid this.
I believe this kind of unexpected changes should a bad new for version control.

Thanks in advance!