Can too many submitted manuscript hamper your candidacy for getting a position? I've been working in a lab for more than 3 years and during this time I have worked on several projects. I have collaboration works too. Most of my projects have been submitted recently. For example, I have finished a project a year ago but it got so many corrections from the supervisor that it took a year to be submitted. Side by side I finished another project. Now, while upgrading my CV, I see so many 'submitted' projects. 
Will it make a negative impact on the Ph.D. admission committee thinking that my work might be substandard?
Or is it ok to include all the projects that I have worked on and still working? (almost 6/7)

P.S. All my published works have been published in good journals till now.
It's pretty hard to imagine that it would be a problem. More is generally better. And the time to publication for a submission can be long. It seems better that you keep working and submitting rather than waiting for one to complete the process. 

It shows you are active. Always a good thing.