Can too many certifications affect landing a PM job?

Align your certifications to the job you are applying for directly. In my job search I have found many employers are seeking direct knowledge. The interviewer and or HR Department many times do not understand your certifications and become intimidated.

I think what is most important is that you are currently using those skills at your job and the certifications are not just "academic". Since many certifications do not require a practical part. Being able to prove that you are able to apply what you have learnt is the most important.

I agree with Earl. The more certifications you have, the more marketable you are. Employers often want unique combinations of skills, so additional certifications give you an advantage over other job seekers. Also, certifications can demonstrate your drive and commitment to growth. A good manager will value this, but an insecure manager might see you as a threat to his or her position.

You only have 5 certifications. PMO, CSM and ITIL are regularly accomplished by Project Managers. The only additional one you have are COBIT and a Six Sigma.
I see nothing unusual about your certifications.
Looking at your LinkedIn account it you may want to refine your experience information. You may want to show less and put more focus on those positions that support the type of job you are looking for. Drop everything before 2001. Move your volunteer activity from experience down to the volunteer section. Review the remaining position and reword their descriptions to align with your PM skills.
When searching for a job you need to treat it like a project you are managing. You need to find that one thing that is your niche and market it.
Good luck in your search.

I believe having more certifications is always good for your knowledge, training, skills, and experience. However, having "too many" certifications on your resume sometimes make the hiring manager think you are "too expensive" or "over qualified" for the position. I would suggest obtaining as many certifications you think you need or interest you. However, only list the certifications that is requested or relates to the role.

Overall, I like LinkedIn. However, I do not like that recruiters and hiring managers is only able to see an overview of you and not what you can provide as an asset for a particular role.

Unfortunately with recruiters and hiring mangers, everyone preference is different. For example, I contacted two different recruiters. One believe 10 years of experience was enough and another recruiter wanted to see more than 10 years of experience. What makes it worst is you cannot ask them before you submit your information what they perference is and what are they looking for. It is not you. Keep on believing in yourself and push forward. I hope this helps.