Need advice on re-staining

Hi, I’m in Georgia, my deck is in full sun, and it’s pressure treated pine. The deck was built in 2014, left to weather for 12 months, and then cleaned with the restore-a-deck system (cleaner and brightener), and then stained with 1 coat of Armstrong Clark semi transparent. After the application of the stain, I had many areas of the deck where there were beads of some sticky substance coming up from the wood. I thought it was weird (I didn’t read anything about that happening during my research on your site before I did it), but I didn’t do anything about it. Anyway, AC recommended a second coat of the stain on the horizontal surfaces in 12 months. My question is - do I do the restore a deck system again before I add more stain? And do you know what the sticky beading was and can I avoid that this time? 

Thank you so much!