Hi,
Which one is red User or MM Addr? If it is MM Addr that means that you are not providing DOGE address to Merge mine DOGE coins. In order to do so and get DOGE also you will need to provide DOGE address inside your password as explained in pool home page. Otherwise you are going to mine LTC only. As long as you see your LTC address (some chars in the middle skipped to keep your privacy as long as possible) in users/workers page all is GOOD
Please post here or send me a PM with your config. Screen shot of web interface or ssh config whatever your L3+ has
Best
PS:
---------------
Also on average how many litecoin blocks will an L3+ solve a month?
--------------
Assuming 520 MH/s
Expected Time per Block   29 days 08 hours
Big Fat notes:
1. We are talking about PROBABILITY and  there is no guarantee. In other words at CURRENT networking diff you are expected to solve one block per month. You can solve 10 blocks (GOOD LUCK) per month or you can solve 0 blocks per month (even year BAD LUCK) also. No Guarantees. That is what PROBABILITY is.

https://www.litecoinpool.org/calc?hashrate=520&speedunit=MH%2Fs&difficulty=306983.06700834&price=41.7145¤cy=USD&power=1000&energycost=0.10
-------------------
 Is it worth trying?
-------------------
You are the one to decide....Math is Math (1=1 always) Luck is Luck. Imagine that you are buying ONE of two (The lottery has two tickets in total) lottery tickets available for a lottery. You have 50% chance winning the lotary right? Will it happen today, tomorrow or the day after tomorow ? Each time you have 50% chance it must happen someday for sure but when? Or you can win 10 times in a row That is LUCK
Good luck