1 Cor 12:
7Now to each one the manifestation of the Spirit is given for the common good.
8To one there is given through the Spirit a message of wisdom, to another a message of knowledge by means of the same Spirit,
9to another faith by the same Spirit, to another gifts of healing by that one Spirit,
10to another miraculous powers, to another prophecy, to another distinguishing between spirits,
to another speaking in different kinds of tongues,a and to still another the interpretation of tongues.
Speaking in tongues and interpreting of tongues are two different gifts. The verse above says one is given one and another is given the other. It doesn't make sense if one person has both gifts; why would anyone speak something unknown if they have an interpretation? it is easier if they just go directly to the interpretation. That's why the two gifts should be given two people.
Paul has insisted on speaking things that are understood, so if tongues are spoken and there's no interpretation, the person needs to
PRAY for an interpretation so that the church is edified. If not, Why pray for a gift that you already have?
1 Cor 14:
4 Anyone who speaks in a tongue edifies themselves, but the one who prophesies edifies the church.
5I would like every one of you to speak in tongues,
b but I would rather have you prophesy. The one who prophesies is greater than the one who speaks in tongues,
c unless someone interprets, so that the church may be edified.
The baseline is, the tongues as spoken today make no sense. The 'spirit' that has given many the ability to speak in tongues is yet to give a single person the ability to interpret. Show me where someone spoke and another interpreted and even that i'd doubt.
There's absolutely no reason to say that some are fake and some are real, all indicators point towards fake.
The same spirit that gave disciples /apostles the ability to raise the dead/ heal the sick- if there's no raising of the dead today there's absolutely no reason to believe these tongues are real either.