2003 Ford Explorer Transmission

I have a 2003 Ford Explorer XLT V6. With 128,000 miles. I've always kept the maintenance on it and took great care of it since it had 25,000 miles. Most miles are highway miles. I recently took it in to a local Midas shop, where I had them change the oil and filter in my transmission, change transfer case oil, and oil in both my diffs. The very next day I started experiencing transmission problems like, when I come to a stop its hard shift into first gear. I hear a straining noise when switch the gears into Drive from Park, . And just overall its not smooth since the oil change. With something as simple as an oil change, is there anything the shop could have messed up to have these problems, like not enough tranny fluid?