You may have adjusted your saddle too much at one time,
( moving a saddle forward effectively reduces saddle height!!)

You may have moved it too far forward, see references to tibial tuberosity, set-back for-aft adjustment in earlier threads

You may have a leg length difference

If you don't stretch AFTER exercising, DO SO

Home Exercize: Get some surgical tubing, bunjee cords, old inner tubes etc., tie them to something, sit in a chair and do some leg curls.

Get some weights and a weight bench with a "leg bar", check out yard sales, thrift stores and newspaper ads to save money.
( I found an Olympic weight set at a yard sale a while back and just bought a weight bench at Wal-Mart of all places!, total spent -$150.00)

If you don't have a commercial gym nearby or can't afford one, check out you local State or Community College, you can may be able audit a P.E. class inexpensively. Very often the College is REQUIRED to offer facilities to the commmunity at no charge or for a nominal fee.

Ride Careful
Pat