With respect to the battles that you show in this article, I want to point you that it is clearly stated in the rules of combat that if you use low level cards you will be penalized with a reduction of your earnings. To avoid penalization in silver league figths you must use cards that have at least levels 3,2,2,1 (common, rare, epic, legendary). It is not necessary that you have all your cards at maximum levels for that league, only the stated minimum level for each league.
For example, in the second battle you used two level 1 common cards and 2 level 1 rare cards, that are below the minimum level required, so you has been penalized for that.