Fix bug from custom indicator

I have a custom indicator that a previous developer was unable to fix after 3 months. The developer could not fix his own indicator he created so I now need to find someone else with the skill set and experience to fix it.

The indicator gives buy and sell signals and plots arrows on the chart. The bug is that on the M1 and M5 time frames the arrows will move our of place at random places on the chart. After refreshing the indicator the arrows go back to their correct positions on the chart. This only happens after 1-2 days of the indicator being left on the chart and this only seems to happen on the M1 and M5 time frames, not higher time frames.

The original developer was unable to figure out what was causing this to happen so I am forced to look for someone else to try fix this. I've had very bad luck finding a good developer to work with and hope that I can find someone to do this job successfully and work together on future projects.