Flip flopping is to be expected as more data comes into play. There is intuitive sense that wearing a mask should reduce; however, the risk is that people assume they are completely protected and then go into crowded social situations where one person is infected and it turns out it's not effective.Flip flopping definitely doesn't help, but right now, there are a few studies that say it MAY increase infection, but if you read in detail why, it still makes sense to wear masks. I wouldn't be surprised in a few months that there will be research that shows that wearing masks outweighs the risks of not wearing mask.
This isn't much of a study, but it tried to see if masks would prevent the patient from transmitting the virus. The result is no: New study questions the effectiveness of masks against SARS-CoV-2.
But it isn't much of a study... still, there's going to be conflicting data for the time being.
The danger is that masks aren't effective specifically for COVID-19, we open up, and then get a second wave of infections. Other studies may have used viral surrogates, so there is always a danger that it's not applicable to COVID-19.