The hammer follows the Slide forward when fireing
How do I fix this problem?
This can be caused by several different things, ranging from damage to the sear or hammer spur to worn leaf spring to a bad trigger job. If you could provide more info I could help more.
Follow down is most likely caused by negative sear engagement and/or not enough sear engagement. I recommend taking it to a trusted gunsmith to have it fixed. Shameless plug, I am a gunsmith at J&G Gunsmithing, so you can contact us about sending it in for repair. Let me know if I can be of more help.