Many times the reason for a rejection of a paper like this is failure to properly control for possible anomalous conditions. If you don't have an explanation, the minimum you should do is to control for every possible other explanation. If you haven't fully tested whether the phenomenon you observe might be due to something else, then a reviewer must reject the paper.
It is equivalent to the famous Sherlock Holmes quote, “Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.”
If you haven't eliminated the impossible, you can't conclude you have found improbable physics.