Knee "hollowness", cracking and discomfort from few weeks

[sagarbhathwar]

My leg day workout consists of the following:
6 sets of squat - 6 to 8 reps
3 sets of inclined leg press - 10 to 12 reps
3 sets of standing calf raises - 10 to 12 reps
3 sets of sitting calf raises - 10 to 12 reps
3 sets of hamstring curls - 10 to 12 reps

Of-late, my knees feel hollow and after today's workout, I'm having slight pain on the upper portion of both knees. I also feel 'cracking' in both knees when I extend my legs, coming from the top portion.

My squat form(Can't post entire link due to restriction, broken down). The weights is 90 pounds:
youtu (dot) be (slash) bQ0zZ3GvY3Q


Also, everyone in my gym, including instructor don't know the right form. They are okay even when I lift my heels(as I did two times in the video), my shoulders go forward etc. So, I'm asking for help here. Is the squat form okay or should I improve?

NOTE: I noticed I lock my knees when doing standing calf raises. Could this be a problem?

If this is an injury or an imminent injury, what's the recommended rest time?

Thanks

[ironwill2008]

...

[HeMB]

The pain may not be related to squat technique. It may be due to muscle imbalance, where quads are stronger than posterior chain. Your current routine actually is neglecting it. 2 quad dominant exercises and only 1 crappy leg curl? You want to add deadlifts or RDL to your workout, otherwise say hello to Patellofemoral pain syndrome

[sagarbhathwar]

The pain may not be related to squat technique. It may be due to muscle imbalance, where quads are stronger than posterior chain. Your current routine actually is neglecting it. 2 quad dominant exercises and only 1 crappy leg curl? You want to add deadlifts or RDL to your workout, otherwise say hello to Patellofemoral pain syndrome

I do conventional deadlift on Pull day after by back and bicep routine. Would stiff legged deadlift on leg day be a better option?