[Open] Items with energy bonus don't always work with other items

Thank you, for answering me! Yes, these two items add +1 energy recharge to toilets, according to their description.
I had the spawesome toilet(this add + 1 energy recharge to toilets), spawesome vanity(this add +2 energy recharge to toilets), and the plush paper roll (+1 energy recharge to toilets), so these altogether with the basic 2 energy, recharge my sim’s energy with 6.
And then I bought the soap and the hand towel, because these items add 1-1 plus energy recharge to the toilets, but no, the toilets still gives 6 energy to my sims when they use it. I don’t know, if this is an error or something...
Thank you!

Hm.... it does not matter, where do you place the items. For example, the things I place next to one of my beds, gives the same plus add to the other beds in my house. And with the beds, the energy cumulative, my bed gives 23 energy recharge from various items.
Just the similar items don’t give plus energy, like two paper roll still gives one energy recharge, or two bed side table (even if they are two different types).