Seems like splunk does a simple string comparison on the version info which did work up to version 4.9.x but starting from version 4.10.x splunk complains about it, as 4.1x is lower than 4.9.
As far as I know there is nothing you can do about it other than open a ticket or ignore the message and know that 4.11 is actually a higher version than 4.9.
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