Player confidence can have a big effect. If you go on a good run, the game almost plays itself in my experience (and this has been the same for the past 10-15 years). The struggle is when you go on a bad run, its very difficult to get the team going again. Also, strikers go on goal droughts.
Also, inconsistency reflects real life - look at United last year, where it would seem we had turned a corner and then we would have a bizarre loss again.
Are you relatively new to FM? If so, it might be easier to start with a bigger club in a more developed league. I suspect the Romanian league don't have that high quality players, so they will be less likely to actually be capable of following your tactical instructions, and your coaches less capable of training them well - hence the degree of randomness in how games turn out will be higher. Maybe start a save in a higher quality league, with a high quality team, and get more used to the tactics there whilst enjoying winning a few games - Juve in the Italian league or Bayern in Germany, or Chelsea/City/Spurs in the Prem might be good options.