According to both the russian eador genesis wiki and english eador motbw wiki, the score modifier starts at 25% for beginner and increases by 25% every next level. However, this is not what I'm getting, instead I get 12% for beginner, 25% for skilled, 56% for competent, 75% for expert and so on until 131% for overlord. Can someone tell me if this is working as intended? Thanks.

These are multipliers to total score.
For example,something gives 20 points of glory on default expert.. Then it is multiplied by difficulty - you will get 5 points on beginner, 35 on overlord. for the same effort.
There is another penalty for playing longer than specific amount of turns., which caps at -96%

I understand what the multipliers are for, what I meant was, after i win or lose a shard, when I click on the statistics for the score breakdown, that is the percentage that is listed for me depending on the difficulty I chose: 12% for beginner, 25% for skilled, 56% for competent, etc. So if i get say 200 points for winning that shard in beginner, it gets reduced to 24 then to some other figure depending on the turns taken. So I was wondering why it is much less than stated in the wiki. Thanks

Did some testing and found that this is indeed the case. Pity it wasn't stated anywhere, hence causing me to be confused about the modifier shown during the score breakdown. Thanks.