So, when did it start bubbling? Sometime Sunday night? Can you make a guess as to how many hours it was bubbling?
That kit shows Fermentis T-58 yeast 59-68 deg F. How are temps?
You don't need to worry. It is very likely fine. There could be a leak in the lid or the airlock seal. If you shine a bright LED light down on the top edge of the lid, you should be able see some krausen fluff shadows inside the bucket near the fill line.