what are the changes captured in the change history for this monitor?
common reasons for false alerts are:
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changes to unwanted parts of the page. this can be handled by excluding the unwanted parts of the page
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partially loaded page. increasing the “wait for duration” can help. in certain cases, erroring out a check helps too. please see Exclude failed page load when checking changes - #2 by ajitk
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unwanted changes in the selection where it is not possible to finetune the selection anymore. conditions can help in such cases.