understanding multiple arrows on the chart - help

Hi, I didn't understand why on my charts the "entering" and "exiting" arrows are shown several times repeatedly even if they don't reflect real trades. In general it looks like they confirm something already happened in the past and every time I reset the broker API.
Look the attached picture in which my strategy entered @20855 and the chart proposes the same again the day after :


Another not completely clear behavior is below in which sometimes I get the exit position with no price (@0 limit):
Please can you explain something more?

auato,

Can you please upload the Log files with Feedback tool? Please also specify Broker Order IDs and order generation time of the affected orders in the Description.